Arbor



Jan. 8, 1952 E. A. CROSBY 2,582,010.

' ARBOR Filed Apfil 5, 1949 INVENTOR. lam/n1 2? BY WW1 V M A TTOR/VEV Patented Jan. 8, 1952 UNITED 7 Among Edward A. Crosby, WestNewton, Mass. Application April 5, 1949; Serial No. 5,650

1 f This invention relates tov apparatus principally for use in winding paper or other flexible sheet material on a tubular roll or in unwinding such material therefrom so that a positive connection is established between the arbor and a surrounding tubular roll of sheet material with either a paper or metal hollow core. Ordi--v narily the 'roll is supported and driven or braked through a heavy steel shaft, fitted either with a complicated expanding arbor or, more commonly, with wedges driven in between the surrounding core and the shaft to prevent the slipping of the core on the shaft Such wedges frequently distort the core, preventingits reuse and damage the inner layers of the mate'gial on the roll with consequent waste of the material, unless a heavy expensive steel core is used.

' The advantages of my invention include the establishment of a positive connection for either driving for winding, or breaking for unwindmg, without the necessity of wedgesor complicated arbors between any type of hollow core andithe arbor Of this invention, which in its prefeired form may be made of aluminum or other lght material'suitably attachedto a central shaf or a portion thereof of an existing device. Further advantages of my invention include a saving of sheet material by the non-destructive means of gripping, and with a saving in weight and of driving power needed in older devices requiring the use of a longer central steel shaft and heavy steel cores. The present construction is inexpensive to manufacture and repair, and automatically achieves the necessary positive gripping. Also, cores of larger interior diameter may be used on the arbor by the use of of adapter arbors of various external diameters which may be installed on the permanent arbor as hereinafter described.

The functioning of the various parts of my invention is best understood in connection with the drawings illustrating the preferred form of the permanent and adapter arbors constructed according to my invention, in which:

Fig. 1 is a side elevation, partly broken away, showing the novel device of this invention;

Fig. 2 is a cross section of the device of Fig. 1 taken on' line 2-2 thereof;

Fig. 3 is a side elevation, partly broken away, showing .a modification of the device of Fig. 1; and" Fig. 4 is a side'elevation'view, showing a. further modification of my device.

.; Referring to Fig. 1, the device includes a hol- 6 Claims. (01.242-72) low arbor 2, mounted on stub shafts 3, which may either be driven or supplied with a braking device. Of course, a continuous single central shaft may be employed but is heavier and more expensive. A cord 1 lies in an axially extending slot or groove 5 of special form in the exterior surface of the arbor 2 and is anchored at the ends of the arbor to movable collars 9, loosely mounted-on shafts 3, so that as the cord moves laterally or circumferentially within the slot or groove 5, it will rotate the collars 9 with respect to the shafts 3 so that the cord will tend to remain at all times substantially parallel to the axis of the arbor. Fixed collars ll may be used to hold the movable collars 9 against separation and excessive tautness in cord 1. To aid in ready rotation of collars 9, the end edges l2 of the groove 5 may be chamfered as shown to prevent binding of the cord by too sharp angular contour at the edges of thearbor 2, since if binding occurs, the cord 1, due to its flexibility, will bend and so tend to grip a surrounding core in its central portion only. The cord 1 is distortable to provide a substantially continuous contact along its length with the surrounding hollow core I4 despite any undulations or variations in the interior surface of the core, and having a coefficient of friction such that a slight rotation of the core with respect to the arbor will move thecord laterally or circumferentially and bind the:

arbor to the core. 7

Referring to Fig. 2, the mounting of the cord I, in the slot may be readily seen. The slot or groove 5 is of greater depth at one side than at the other (formed by a chord and a radius in the device shown), so that when a rotative force is applied in one direction, the friction between the cord 1 and the contacting internal opposing surface of the surrounding core (however smooth said surface may be) forces the cord '1 towards the shallow sidezof the groove 5 where shown as or groove 5, where the gripping action is slight,

permitting the easy axial removal of the core with its roll of sheet material from the arbor 2 following a a slight conter rotation to release the grip. The arbor 2 'is constructed with a heavier portion of the sidewall I3 at the slot-or groove 5 to provide an arbor of uniform-strength,

and;with an extension. ofthe sidewall 15 on the:

opposite side of the arbor 2 for balancing the arbor. r

If desired, an increased clearance between the arbor 2 and a surrounding core can be provided if v a portion of the groove is fitted with a metal strip 10 seated in a depression 4 on the bottom of the groove, said strip being urged radially outwardly through the action of springs 6 lying in holesi}. The central portion of cord 1 extends over the-metalstrip in and is urged thereby; in a direction radially of the arbor far enougn'to con tact the internal opposing surface of the surrounding core. so that the wedging and gripping action will take place. The metal strip lll'needi V not extend the entire length of the groove 5 and is preferably positioned near the deep side'ofthe groove and midway of its length.. frhisarrange ment also requires less eflort to slide the core said arbor extending longitudinally thereof, a part of said wall portion extending from a line of less radius at the bottom of said depression at an angle to said radius towards a line oi greater radius, thereby providing a wedging sur face in said depression, a longitudinally extending distortable cord of substantially circular cross-section disposed in said depression and movable. along said wedging surface between said lines; the diameterlofj said distortable cord being slightly greater than the depth of said depression at said line of less radius and the surface of said distortable cord having a coefiioient of friction adapted to cause it, when contacted by a surrounding smooth unyielding internal wallof a hollow core positioned over said arbor, to moverialong said wedging surface to on the arbor because frictional contact1between-- the core and the cord istlimited to a. small centralportion until this centralportion forces the entire #cord. into: friotionally gripping, relation When-:the rotating action takes .place.

Fig. 3 shows oneiorm of adapter arbor. [6, in place on anarbor l8, permanently installed on ashaft- 2d. mn-e adapter arbor is hollow and of sucn insi-de diameter to 'fit over. the permanent arbor [8 andbe-gripped-by the cord 11 in the slotor :grooveon the permanentarbor in the same manner as-thecore of a roll or sheet material would be gripped. Y On I the-exterior; surface of the adapter arbor, an axially extending slot or groove I 8 contains a cord-- 21 which :together function as just" described in connection with thesimilar 'cord' I and groove 8e The cord 21 is' gripped atits ends bymovable collars 23,

which permit'the cord to move laterally or. circumferentially within the slot or groove; While remaining at all -.-'tiines substantially parallei to the'a'Xis of-the arbor. Fixecicol-lars 2-5- and 28, may be o fdesser diameter thanthe-arbor, or-of greater a' stop for the roll of sheet material is desirable. Thewed-gingand gripping action of the cord on the adapter arbor 'on--the cor-e of a rollof-'- sheet-material is the' sameasthat of the permanently installed arbor on a roll of sheet material;- Theadapter' arbor need notextend the -entire leng-tnot the permanent arbor, as shown in Fig. 4,- but may be orashorter length and adapted to-beused in pairs to supper-t a roll of sheet material, in order toincrease the easeofhandling andrediice the weight in large sizes of adapter arbors.

- 'Mynovel ar-bor provides an inexpensive I and practical -means 1 for holding a roll of sheet m'a terial, and by theuse or-my adapter-arbors; can accommodate rolls of sheet material with various diameters of cores witnout complicated and expensive changes; 7

---Though I have described andshown thep're- 1 ferredformfof my device inclnding a rubberized on other friction-surfaced cord secured at the ends of the arbor Wit-I1 movable collars, any

. distortable, that is, flexible as" well as deforniable, iongitudinally extended cord including a wire cable-having a sufiicient: frictional coefiioierrts-to: renderback; and forth lateral-lyof thelockthecore against further rotation relative to said'arbor in one direction as the cord moves up said wedging surface and to release the core from "said lock-upon rotation of said core relative to" said arbor in' the opposite direction as said cordmoves down s-aid'wedging surface.

2; An'arbor as claimed in claim 1 having means for'anchoring said distortable cord at the ends of" said arbor, said means being mounted for movementrelativeto said arbor while saiddistortable cord moves in said depression to and from wedging'position to hold said cord against separation from said arbor while permitting wedging movement of said cord along substantiagllyv the entire length of said depression.

-" 3. An'arbor as'c'laimed in claim lhaving means for anchoring said distortable cord atthe ends groove. and bind the: arbor-andL-the surrounding;

unyieldingsmooth suface of ametal, paper, on fibre core will achieve asimilar result.

-..-I.claim; ariami'adapted :for use in winding or 1111- winding .:a roll 50f. paper or: the like i on a rigid hollewrcylindrieal core, .said .arborhaving' a wall; portion definingia depressionain ithezsurfice ot' of saitl'arbor, at least one of said" anchoring means being ofless diameter. than said arbor to permit a cursor only slightly greater diameter than the diameter of said arbor to be passed'over saidanchcring means onto said'arbor.

4- An arbor as ciairned'in claim 3 which saiddistor'table cord is a wire cable.

'5. An arbor as claimed in claim l'having a pan of anchoring means for said'dis'tortable cord, one at each end of said arbor, each beingm'ounted forirotation relative to said arbor, as said'dise tortableicord moves in said depression to. and fromwedging position to nold'said cord'against separation from said arbor? while permitting wedging movement of'said cord'along substan- .tially the entire'lengjth of saididepression.

6. An arbor as claimed in claim 5'wherein the anchorin'gimeans' are of" a diameter nogreater than the diameter of said arbor and the dischoring means; ends oi'saiddepression wall. portion being chamfere'd'to reduce the-angle of the.

bend of'said cord'over said arbor ends.

' EDWARD a. CROSBY.

REFERENCES CITED Theffollowing references areof record in. the

of thispatent: V

UNITED. STATES 1 Name Date Mofiatt June 11', 1901 Forbes- Mar; 24; 1925 Schubert; June'7, 1'92? Markle, Jr. Aug. "7,1945

Number Germany when James, r931 Welch; Mar. 4; 194:7 

